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A Pro-Russian activist sits in front of policemen guarding the burned trade union building in the southern Ukrainian city of Odessa on May 3, 2014. More than 30 people were killed in a "criminal" blaze in Ukraine's southern city of Odessa, as violence spread across the country during the bloodiest day since Kiev's Western-backed government took power. Ukraine's interior ministry said at least 31 people had died in the fire Friday, with local media reporting that pro-Russian militants were believed to have been in the burning building at the time. AFP PHOTO/ ANATOLII STEPANOVANATOLII STEPANOV/AFP/Getty Images

KRAMATOVSK, UKRAINE - MAY 03: A man watches from a rooftop as Ukrainian soldiers assault a pro-Russian activists roadblock on May 3, 2014 in Kramatovsk, Ukraine. At least one person was reported killed in the fight. Over the past couple of days the Ukrainian army has been assaulting pro-Russian checkpoints in and around Kramatovsk which sits on the edge of Slovyansk, a pro-Russian activist stronghold. (Photo by Scott Olson/Getty Images) *** BESTPIX ***

Confederate troops march back to camp after fighting in a re-enactment of the Battle of the Wilderness, southwest of Fredricksburg, Va. on Saturday, May 3, 2014. Re-enactors and spectators converged on Spotsylvania Courthouse to commemorate the 150th anniversary of the Civil War battle. (AP Photo/The Free Lance-Star, Reza Marvasthi)

Photo: Reza A. Marvashti, Associated Press

Confederate troops march back to camp after fighting in a...

Confederate troops march back to camp after fighting in a... Photo-6257343.85172 - SFGate

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EDS NOTE GRAPHIC CONTENT - Bodies of victims killed in ethnic violence lie covered in the rain on the banks of the River Beki, as security officers patrol the area on a boat at Khagrabari village, in the northeastern Indian state of Assam, Saturday, May 3 2014. Police in India arrested 22 people after separatist rebels went on a rampage, burning homes and killing dozens of Muslims in the worst outbreak of ethnic violence in the remote northeastern region in two years, officials said Saturday. (AP Photo/Anupam Nath)

A woman cries back dropped by police troops guarding the burnt trade union building in Odessa, Ukraine, Saturday, May 3, 2014, where more than 30 people died trying to escape during clashes the day before. Odessa had been largely tranquil since the February toppling of President Viktor Yanukovych, who fled to Russia. But clashes erupted Friday between pro-Russians and government supporters in the key port on the Black Sea coast, located 550 kilometers (330 miles) from the turmoil in the east. (AP Photo/Vadim Ghirda)

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A Somali man looks down at a blast victim as a wounded Somali mother (R) holds her two children, one wounded and one dead, after a huge explosion believed to be a roadside bomb killed 7 people in the centre of the Somali capital Mogadishu on May 3, 2014. The bomb went off near the busy KM4 junction in central Mogadishu, close to the Turkish embassy. Another security source at the scene said the bomb appeared to have been planted at the side of the road. The attack is the latest in a string of bombings in the city attributed to Al-Qaeda-linked Shebab rebels, who are battling to overthrow the war-torn country's internationally backed but fragile government. AFP PHOTO / Mohamed AbdiwahabMohamed Abdiwahab/AFP/Getty Images

SEOUL, SOUTH KOREA - MAY 03: A boy ties a yellow ribbon of hope for the safe return of missing passengers and tribute to the victims of the sunken ferry Sewol on May 3, 2014 in Seoul, South Korea. On April 16 the Sewol ferry carrying 476 passengers sunk off the island of Jindo. More than 302 passengers are dead or missing and the cause of the accident is still under investigation. (Photo by Chung Sung-Jun/Getty Images) *** BESTPIX ***

Pro-Russian activist waves a Donetsk republic flag in front of the offices of Industrial Union of Donbass Corporation in Donetsk, eastern Ukraine, Saturday, May 3, 2014, which has been captured to honor the memory of fallen comrades during fighting with pro-Ukrainian activists in Odessa on Friday. The building houses the offices of Industrial Union of Donbass Corporation, owned by government-appointed Donetsk region governor and billionaire Serhiy Taruta. No police were deployed to block the building takeover. (AP Photo/Evgeniy Maloletka)

LONDON, ENGLAND - MAY 03: The Archbishop of Canterbury, Justin Welby, jokes with a crowd of hundreds of women priests who posed on the steps of St Paul's Cathedral before going inside for a special service to celebrate twenty years since the ordination of women priests on May 3, 2014 in London, England. More than 600 women priests attended the service which comes ahead of a vote in July when the Church of England is expected to pass legislation that will allow the women in the church to be ordained as Bishops. (Photo by Mary Turner/Getty Images) *** BESTPIX ***

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People take pictures of Pope Francis with cameras, mobile phones and tablets during a meeting with members of the Catholic Action at Paul VI audience hall on May 3, 2014 at the Vatican. AFP PHOTO / ALBERTO PIZZOLIALBERTO PIZZOLI/AFP/Getty Images

Photo: Alberto Pizzoli, AFP/Getty Images

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People take pictures of Pope Francis with cameras, mobile...

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People take pictures of Pope Francis with cameras, mobile... Photo-6257040.85172 - SFGate

MADRID, SPAIN - MAY 03: Andrea Petkovic of Germany in action against Sara Errani of Italy during day one of the Mutua Madrid Open tennis tournament at the Caja Magica on May 3, 2014 in Madrid, Spain. (Photo by Julian Finney/Getty Images) *** BESTPIX ***